Stencil sheet and stencil adapted for use in duplicating



Jan. 18, 1927. 1,614,549

I S. GESTETNER STENCIL SHEET AND STENCIL ADAPTED FOR USE IN DUPLICATING Filed March 4 1926 515 b kl? baTzsQ-jg' Fz i.

Q 55.51am; m 3007 4/1 esz e fin r- 7 Patented Jan. 18, 1927.

UNITED STATES PATENT OFFICE.

SIGMUND GESTETNEROF LONDON, ENGLAND, ASSIGNOR '.[O D. GESTETNER LIMITED, h OF LONDON, ENGLAND.

STENCIL SHEET AND STENCIL ADAPTED FOR USE IN DUPLICATING.

Application filed March 4, 1926, Serial 110. 92,308, and in Great Britain March 20, 1925.

with) a coatingof an ink-resisting .composition.

= In certain cases the stencil is produced by 10 photographic means, while in others it is formed by'stencilizing a stencil sheet with e the aid of astyle or in a typewriter or otherwise.

' It is the general practice to secure such stencil sheets to a backing sheet, one purpose of which is to protect the stencil sheet during storage and transport'while another purpose is to facilitate stencilizing'by pres- :sure, the'backing sheet providing a support for the stencil sheet during this operation. In addition a portion of the backing sheet usually forms what is called the heading ofthe stencil, that is to say the meanswhereby the stencil is secured in association with the inking means of the duplicating machine and when theste'ncil has been located on the machine the major portion of the backing sheet is removed, only 'the smaller sec tion thereof which forms the heading being left secured to the stencil sheet.- To facilitate this detachment, the backing sheet'is perforated or rouletted adjacent the upper end of the stencil.

For the majority ofmachines at present on the market, the matter is cut in the stencil on lines which will be parallel with the axis of the inking means of the machine.

In the specification of British Letters Patent No. 202,7 36 a duplicating machine of the kind in which the stencil is mounted on an endless-flexible carrier travelling over "a plurality of inking rollers is described and claimed which is adapted toproduce simultaneously a stencil impression in a pluralit of colours. With a machine of this kin "in normal use, it is necessary that the stencil' should be mounted upon the machine with the lines of matter cut in the stencil at right angles to the axis of the inking means.

same ina typewriter having a carriage for the usual quarto-sized paper so asto type thereon with the lines of matter running parallel with the longer side of the sheet.

Moreover, with stencil sheets adapted for use with duplicators of the kind in which the stencil is secured to an endless flexible carrier running over a plurality of inking rollers, it is not convenient to employ rollers of such'a small diameter that a stencil sheet substantially less than 15 in length, measured from the base of the heading to the opposite end of the stencil, may be employed.

The object of the present invention, broadly stated, is to provide an improved construction of combined stencil sheet or stencil, that is to say, an improved combination of a stencil sheet 01' stencil with a backing sheet for use with such machines.

According to the present invention, one of the sides of the stencil sheet is secured"- throughout its length to "the corresponding side of the backing sheet and fastening means whereby the stencil is secured in association withthe inking means of a duplicator are arranged or'are adapted to be formed adjacent to the edge of the backing sheet remote from the edge. to which the edge of the stencil sheet issecured.

ith this construction the whole or the greater portion of the backing sheet forms the so-called heading of the stencil and nor mally the backing sheet is not formed so thatit may be readily detached from the sheet, although in one modification a detachable element forming a continuation of the backing sheet may be provided.

A combined stencil sheet in accordance with the invention, in contradistinction. to those hitherto known, will normall have one of the longer sides of the stencil sheet secured throughout its length to the .correslponding side of the backing sheet.

djacent to the line of connection between the backing sheet and the stencil sheet the material of the former may be thinned or frayed with a view to reducing the possibility of rupture of the connection or injury to the stencil when in use.

To facilitate mounting the stencil sheet on the duplicating machine any convenient means may be employed. For instance, a "'5 plurality of keyhole or other suitably formed slots may be formed adjacent to the edge of the backing sheet opposite to that to which the stencil SllGZ-i) is secured.

Alternatively, the material of the backing sheet may be locally weakened adjacent to the edge thereof remote from that to which the stencil sheet is connected to facilitate perforation of the edge by fastening means forming part of the duplicating machine. A variety of other means of securing at tachment between the stencil sheet and the fastening means on the duplicating machine may be employed.

In using a stencil in accordance with the invention the fastening means adjacent to one edge of the backing sheet will be connected with the fastening meanson the duplicating machine and the remaining portion of the backing sheet, as well as the stencil, will be brought into contact with the stencil carrier.

In the normal operation of the machine ink will be transferred from the inking means on to the face of the backing sheet adjacent thereto and also onto the rear face of the stencil sheet. The ink will, however, only pass through the openings in the stencil sheet on to the stencil-receiving surface.

By the invention a numberof advantages are secured. The first advantage arises from the fact that the means of making connection between thebacking sheet and the stencil sheet is simplified, gumming or pasting devices of known character being suitable for the purpose in question.

The actual size of the stencil sheet is reduced, for instance a stencil sheet for use in producing an impression on a so-called foolscap sheet may have an area of substantially 13 x 8 or 13" x 9", whereas, as above indicated, in the known stencil sheets the actual stencil sheet for use in a similar manner measures approximately 16 x 9" including the portion which is secured to the heading.

In addition, in such case, the size of the backing sheet is reduced and the necessity for modifying the diameter of the inking cylinders of a machine of the kind in which the flexible stencil carrier travels over a plurality of such rollers is obviated, and, as above explained, the reduction of the size of these rollers beyond certain limits is open to objection.

Further, where the machine is, of the type adapted to print with inks of a plurality of colours or inks of different character and in which the lines of matter cut in the stencil are parallel with the direction of travel of the stencil, a stencil sheet in accordance withthe invention for use in forming the body of the latter may be still further reduced in length. 7

If desirable or necessary, to the edge of the backing sheet an additional sheet of paper may be secured so that when the combined stencil sheet is mounted on the machine the machine may be operated for a short period to cause the ink to pass through the stencil carrier and through the stenci itself on to this sheet which may then be detached and the stencil used in the normal manner.

In some cases the backing sheet may be provided with a detachable extension adjacent to the line of engagement of the backing sheet with the fastening means therefor. such portion being intended to be detached when the stencil sheet is mounted on the duplicating machine.

(.ertain constructions in accordance with the invention are illustrated by way of example in the accompanying drawings, in which Figures 1, 2 and 3 show combined stencil sheets adapted for use with a duplicating machine in which the lines of the matter formed in the stencils will be arranged at right angles with the axis of the inking means of a duplicating machine.

In all of the constructions illustrated, 1 is the stencil sheet, 2, represents the main portion of the backing sheet of which the section 3 furnished with a plurality of keyhole slots 4 constitutes the means whereby the combined stencil sheet maybe attached to the stencil carrier of the duplicating machine.

In the construction shown in Figure 1, the edge of the backing sheet which is of relatively thick paper is thinned or frayed with a view to reducing the possibility of rupture of the connection between the stencil sheet and the backing sheet or injury to the stencil when in use.

In all'of the constructions, connection between the stencil sheet and the backing sheet is secured by pasting or gumming, thereby forming an overlap 'joint 6.

In Figure 3 a sheet 7 is shown detachably connected with and forming an extension of the backing sheet, while in Figure 2 the backin sheet is provided with an extension 8, whic may be severed from the remaining .portion thereof along the dotted line 9 where the material is erforated or otherwise weakened to facilitate such disconnection.

The extensions 7 or 8 may, if of hard or tough or ink-impermeable paper, perform one of the functions of the backing sheet in known constructions of stencil sheet; that is, when the stencilsheet is mounted on a rotary duplicator the extension may be left in position and the duplicator operated until the ink has been forced through the open ings in the stencil and on to the extension when of course the latter will be detached.

Alternatively the extension may act as a protector sheet, such as are commonly whole of the length of one provided .with so-called wax stencils, in

provided when desirable or necessary.

Having now described my invention what I claim as new and desire to secure by Letters Patent is a 1. A combined stencil sheet comprising a sheet of tough paper, means adjacent to one edge of said sheet whereby the same may be-secured in association with the inking meansof a duplicator and secured to the opposite edge of said sheet, throughout the side, a sheet adapted to be stncilized'.'

' ,2. A- combined stencil sheet adapted for use in duplicating machines of the kind in which the lines of matter cut in the stencil run at right angles to the axis of the inking means or parallel with the direction of motion of the stencil when in use, comprising a sheet of tough paper adapted to function as a backing sheet for the stencil sheet durstencilizing, means adjacent to one edge 1 of said sheet whereby the same may secured in association with the inklng means of a duplic tor and secured, throughout the whole leng't of one of its sides to the 0 pcsite edge of said backing sheet, a s eet adapted to be stencilized.

3. A combined stencil sheet comprising a sheet of tough paper, means adjacent to one edge of said sheet whereby the same may be secured in association with the inking means of a duplicator and, secured to the opposite edge of said backing sheet throughout the whole of the length of one of its sides, a sheet adapted to be stencilize'd and in addition a sheet of paper secured so that when the combined stencil sheet is mounted on the machine the machine may be operated for a short period to cause the ink to pass through the stencil carrier and through the stencil itself on to this sheet which may then be detached and the stencil used in the normal manner.

4. A combined stencil sheet adapted for use in duplicating machines of the kind in which the lines of matter cut in the stencil run at right angles to the axis of the inking means or parallel with the direction of motion of the stencil when in use, comprising a sheet of tough paper adapted to function as a backing sheet for the stencil sheet proper during stencilizing, means adjacent to one edge of said backing sheet whereby the same may be secured in association'with the inking means of a duplicator and, secured throughout the whole length of one of its sides to the opposite edge of said backin sheet, a sheet adapted to be stencilized, an in addition a sheet of paper secured sothat when the combined stencil sheet is mounted on vthe machine the machine may be operated for a short period to cause the ink to pass through the stencil carrier and through the stencil itself onto this sheet which maythen be detached and the stencil used in the normal manner.

In testimony whereof I have signed my name to this specification.

SIGMUND GESTETNER. 

